Negative Achromat

Negative Achromatic Lenses are fabricated by cementing two optical elements with together, whereby the negative power element predominates. The pairing of two optical elements together corrects for on-axis spherical aberration and color. POSS’s Negative Achromatic Lenses are also AR coated on both sides, providing even brighter and sharper images. They are often utilized in applications that extend focal lengths together with positive achromatic systems or CCD lenses.


Diameter Surface Quality Diameter Tolerance Center Thickness Tolerance Edge Thickness Tolerance Centering Tolerance
3.00 - 5.00 40-20 +0/-0.05 +/-0.2 Reference 3-5arc mins
5.01 - 25.40 40-20 +0/-0.1 +/-0.2 Reference 3-5arc mins
25.41 - 40.00 60-40 +0/-0.1 +/-0.2 Reference 3-5arc mins
40.01 - 75.00 80-50 +0/-0.1 +/-0.2 Reference 3-5arc mins

Higher precision specifications available upon request. Please contact us with your specific requirement.

Important Note

If your requirement is not included in our stock list, please enquire with us as our in-house production facility can quickly and affordably customize off-the-shelf components to a variety of sizes and shapes that will meet standard, precision or high precision quality.

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P/n Dia. (mm) EFL (mm) Coating Qty